The Illinois

Wright described the proposed structure with floor plans of the “base”, 320th, and 528th (highest) floors.[1]

The Mile High Illinois, Illinois Sky-City, or simply The Illinois was a proposed skyscraper that would have been 1 mile (1,600 m) high, said by Frank Lloyd Wright in his 1956 book, A Testament.[1]

The design, was to be built in Chicago, would have included 528 stories, with an area of 18,460,000 square feet (1,715,000 m2). Wright said that there would be parking for 15,000 cars and 150 helicopters.[1]